Attacking the knight in order to capture the d4-pawn with the bishop.
14... d6f5 This allows White to play c4, although the position remains fine for Black. 15. c2c4  15... d5d4 A dynamic pawn sac that is totally justified. 16. h1a8 Landing a piece on c6 is the alternative, with both leading to equality: 16... c8a8 